气候变化领域集成服务门户(CCPortal): Miocene high-temperature leucogranite magmatism in the Himalayan orogen

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DOI	10.1130/B35691.1
	Miocene high-temperature leucogranite magmatism in the Himalayan orogen
	Gao P.; Zheng Y.-F.; Mayne M.J.; Zhao Z.-F.
发表日期	2021
ISSN	167606
起始页码	679
结束页码	690
卷号	133 期号:2021-03-04
英文摘要	Himalayan leucogranites of Cenozoic age are generally attributed to partial melting of metasedimentary rocks at low temperatures of <770 °C. It is unknown what the spatial distribution and characteristics of high-temperature (>800 °C) leucogranites are in the Himalayan orogen. The present study reports the occurrence of such leucogranites in the collisional orogen. We use the Ti-in-zircon thermometry in combination with the ther-modynamically calibrated relationships of T-aSiO2-aTiO2 to retrieve crystallization temperatures of Miocene (ca. 17 Ma) two-mica granites from Yalaxiangbo, in the eastern Himalaya, SE Tibet. The results give the maximum temperature as high as ˜850 °C for granite crystallization, providing a significant constraint on the nature of thermal sources. Phase equilibrium modeling using metasedimentary rocks as the source rocks indicates that felsic melts produced at ∼850 °C and 6–10 kbar can best match the target leucogranites in lithochemistry. In this regard, the anatectic temperatures previously obtained for the production of Himalayan leucogranites would probably be underestimated to some extent. Such high temperatures are difficult to explain purely by the internal heating of the thickened orogenic crust. Instead, they require an extra heat source, which would probably be provided by upwelling of asthenospheric mantle subsequent to thinning of the orogenic lithospheric mantle by foundering along the convergent plate boundary. Therefore, the Himalayan leucogranites of Miocene age would be derived from partial melting of the metasedimentary rocks in the post-collisional stage. © 2021
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184699
作者单位	Key Laboratory of Crust-Mantle Materials and Environments, Chinese Academy of Sciences, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; Center of Excellence for Comparative Planetology, Chinese Academy of Sciences, Hefei, 230026, China; Department of Earth Sciences, University of Stellenbosch, Matieland, 7602, South Africa
推荐引用方式 GB/T 7714	Gao P.,Zheng Y.-F.,Mayne M.J.,et al. Miocene high-temperature leucogranite magmatism in the Himalayan orogen[J],2021,133(2021-03-04).
APA	Gao P.,Zheng Y.-F.,Mayne M.J.,&Zhao Z.-F..(2021).Miocene high-temperature leucogranite magmatism in the Himalayan orogen.Bulletin of the Geological Society of America,133(2021-03-04).
MLA	Gao P.,et al."Miocene high-temperature leucogranite magmatism in the Himalayan orogen".Bulletin of the Geological Society of America 133.2021-03-04(2021).